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CBSE Questions for Class 10 Chemistry Periodic Classification Of Elements Quiz 5 - MCQExams.com

Which of the following pair of elements do not resemble according to Newlands' arrangement?
  • Lithium and sodium
  • Beryllium and magnesium
  • Boron and silicon
  • Oxygen and selenium
Find the sum of period number and group number of phosphorous?
  • 16
  • 17
  • 18
  • 19
Newlands assumed that only ______________ elements existed in nature.
  • 108
  • 48
  • 32
  • 56
Hydrogen resembles :
  • alkali metals
  • halogens
  • both A and B
  • noble gases
State true or false.
Position of isotopes was clearly defined in Mendeleev's periodic table.
Position of lanthanides and actinides was clearly defined in Mendeleev's periodic table.
  • True, True
  • True, False
  • False, True
  • False, False
Which of the following sets of atomic masses do not correspond to Dobernier traid?
  • 7,23,39
  • 20,38,56
  • 47,91,178
  • 54,95,183
The correct order of atomic size of Na,Be and Mg is:
  • Be>Mg>Na
  • Na>Mg>Be
  • Mg>Na>Be
  • Na=Mg>Be
After the classification of elements study of elements become____________.
  • difficult
  • easy
  • both A and B
  • None of these
Which of the following is a defect in the Mendeleev's periodic table?
  • Prediction of new elements
  • Doubtful atomic weights
  • Anomalous position of hydrogen
  • Non-systematic study of elements
In the periodic table, the elements having greater non-metallic character are placed at which corner of the periodic table?
  • Upper left
  • Center
  • Lower right
  • Lower left
  • Upper right
Classification of elements makes the study of physical and chemical properties of elements ________ and __________.
  • slow, difficult
  • simple, organised
  • Complicated, unorganized
  • none of these
John Newlands arranged the known elements in a/an  ______ order of their atomic _______ .
  • increasing, masses
  • decreasing, masses
  • increasing, numbers
  • decreasing, numbers
Dobereiner was the first person to illustrate the relationship between the ____________ of elements and their properties.
  • atomic masses
  • electron negativity
  • molecular masses
  • number of protons
Which one of the following is an example of Dobereiner's triad?
  • Li,Al,Ca
  • Li,Na,K
  • Li,K,Na
  • K,Al,Ca
Who is father of the Periodic Table of Elements?
  • Johann Baeyer
  • Dmitri Mendeleev
  • Alfred Nobel
  • Johannes Van der Waals
In a triad of A,B,C elements, if the atomic masses of A and C respectively are 100 and 200, then the atomic mass of B is:
  • 300
  • 175
  • 125
  • 150
Which of the following is not a merit of Mendeleev's periodic table?
  • It helped in correcting the atomic masses of some of the elements
  • He predicted the properties of some undiscovered elements and left gaps for them
  • He framed the periodic table with vertical and horizontal columns and gave shape to it
  • He gave separate places to isotopes in his periodic table
Which of the following is arranged in order of increasing metallic character?
  • P<Si<Na<Be<Mg
  • Be<Mg<P<Na<Si
  • Si<Be>Mg<Na<P
  • P<Si<Be<Mg<Na
For which of the pair Newland octave rule is not applicable?
  • Li, Na
  • C, Si
  • Mg, Ca
  • Cl, Br
In which state C can show tetra valency ?
  • Ground state
  • Transition state
  • Excited state
  • All the above
Element with atomic number 35 belongs to:
  • 3rd period
  • 18th group
  • 5th period
  • 17th group
Mark the group which has maximum number of element in Mendeleev's periodic table:
  • I
  • II
  • III
  • IV
In order to fit elements into his table, newlands adjusted three elements in the same slot , but also put some unlike elements in the same slot.
  • True
  • False
The most important active step in the development of periodic table was taken by
  • Mendeleev
  • Dalton
  • Avogadro
  • Cavendish
For which element, the Law of Octaves was not found to be applicable?
  • Oxygen
  • Calcium
  • Cobalt
  • Potassium
 In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?
  • Germanium
  • Chlorine
  • Oxygen
  • Silicon Ana
Doberiener's system of classification into triads was not found to be useful as he could identify only:
  • Two triads
  • Three triads
  • Four triads
  • Five triads
Whose name is not associated with the development of periodic table?
  • Prout's
  • Newlands
  • Rutherford
  • Loother Meyer
State whether the following statement is true or false:
It was assumed by Newlands that only 63 elements existed in nature and no more elements would be discovered in the future.
  • True
  • False
Which one of the following does not increase while moving down the group of the periodic table?
  • Atomic radius
  • Metallic character
  • Valency
  • Number of shells in an element
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